UFETCH(9)              NetBSD Kernel Developer's Manual              UFETCH(9)

NAME
     ufetch, ufetch_8, ufetch_16, ufetch_32, ufetch_64, ufetch_char,
     ufetch_short, ufetch_int, ufetch_long, ufetch_ptr -- fetch data from
     user-space

SYNOPSIS
     #include <sys/systm.h>

     int
     ufetch_8(const uint8_t *uaddr, uint8_t *valp);

     int
     ufetch_16(const uint16_t *uaddr, uint16_t *valp);

     int
     ufetch_32(const uint32_t *uaddr, uint32_t *valp);

     int
     ufetch_64(const uint64_t *uaddr, uint64_t *valp);

     int
     ufetch_char(const unsigned char *uaddr, unsigned char *valp);

     int
     ufetch_short(const unsigned short *uaddr, unsigned short *valp);

     int
     ufetch_int(const unsigned int *uaddr, unsigned int *valp);

     int
     ufetch_long(const unsigned long *uaddr, unsigned long *valp);

     int
     ufetch_ptr(const void **uaddr, void **valp);

DESCRIPTION
     The ufetch functions provide a way to fetch the values of single memory
     cells from user-space.  In each case, the value referenced by the user-
     space address uaddr is retrieved and stored at the kernel memory location
     referenced by valp.

     The ufetch_64 function is only available on systems employing the `LP64'
     memory model, which can be determined by testing for the presence of the
     _LP64 C preprocessor macro.

RETURN VALUES
     The ufetch functions return 0 on success and an error number on failure.

SEE ALSO
     copy(9), ustore(9)

NetBSD 9.0                      March 18, 2019                      NetBSD 9.0

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